>What's protecting the primary winding
>insulation??
The waveshapes on the primary and the secondary a transformer are
virtually identical. Suppress transients on one, and the job is done.
cheers, Paul
>
>PAUL HEWITT
>WD7S PRODUCTIONS
>QRO HOMEBREW COMPONENTS
>http://wd7s.home.att.net
>
>
>> -----Original Message-----
>> From: Richard
>> [mailto:2@mail.vcnet.com]
>> Sent: Sunday, May 05, 2002 10:59 AM
>> To: wd7s@att.net; Ian White,
>> G3SEK; AMPS
>> Subject: RE: [Amps] Rectifier
>> diode strings
>>
>>
>>
>>
>> >
>> >
>> >
>> >> It is quite common to see
>> >> mains spikes of 1kV and more
>> >> on the *primary*
>> >> side of the transformer.
>> >> According to ANSI/IEEE
>> >> statistics, "medium
>> >> exposure" sites in the USA
>> >> can expect several hundred
>> >> 1kV-peak mains
>> >> spikes per year, and even
>> >> 5kV-peak spikes at about 1
>> per year.
>> >
>> >Precisely why MOV's or transient
>> >suppressors should be
>> mandatory in all
>> >HV psu's.
>>
>> ? For full-wave rectifier,
>> choke-filter supplies, and
>> all half-wave
>> rectifier supplies, yes.
>> Capacitor-filter supplies and
>> resonant-choke/C
>> filter supplies have built-in
>> spike suppression, so a MOV
>> is money down
>> the crapper, except for
>> testing a transformer with no load.
>>
>>
>> >....
>>
>> - R. L. Measures, a.k.a.
>> Rich..., 805.386.3734,AG6K,
>> www.vcnet.com/measures.
>> end
>>
>>
>
>_______________________________________________
>Amps mailing list
>Amps@contesting.com
>http://lists.contesting.com/mailman/listinfo/amps
>
- R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K,
www.vcnet.com/measures.
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